Goodman Furnace Gas Valve Not Getting 24 Volts

Getting less then 24 volts may 18 volts causing the valve to chatter.

Goodman furnace gas valve not getting 24 volts. I did check voltage at 24 volt transformer and have 24 volts. Also cleaned th flame switch. Maybe no gas to the pilot. Check directly across the terminals on the gas valve for 24 v ac to test whether the gas valve is getting full voltage a.

Testing with a multimeter lets you know the valve works. If you are not getting 24 volts to the contactor coil then you either have a thermostat problem thermostat wire problem or a safety control problem high or low pressure switch time delay relay. As well as f. Goodman gas furnace intermittent gas valve problem.

When the building reaches the desired temperature a separate signal causes the gas valve to close. In this video i troubleshoot a straight cool ac condenser that does not respond when the thermostat is turned on into cool mode. Is it possible to loose voltage thru the board. For example if the temperature in your house falls below the setting on the thermostat such as 68 degrees fahrenheit the gas valve opens to activate the furnace and produce more heat.

If you have a gas valve that has a pv pilot valve and an mv main valve then i would think that either you are not getting the 24 volts to the pv since the pilot is not lighting to continue the furnace ignition sequence. I checked all safety stats and have continuity. Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components. This sounds like your furnace is sparking clicking but there is not any ignition to the pilot.

If you do not measure 24 volts from w c you should suspect that the ther mostat is not set high enough that it is not working correctly or that a wire between the thermostat and the furnace is open. For example if the red wire is connected to w on the thermostat the furnace should turn on. This video will help you diagnose and troubleshoot low voltage issues you may be having with your thermostat red wire using your multimeter.